Vaccine hesitancy in cancer patients: A rapid review

The perspectives and knowledge of patients with cancer on mpox and mpox vaccination: a cross-sectional study

OBJECTIVE

The recent outbreak of monkeypox (mpox) poses significant public health challenges, particularly for immunocompromised populations such as patients with cancer. However, misinformation poses a significant challenge during new outbreaks for patients with chronic diseases, as observed during the COVID-19 pandemic. Therefore, we aimed to assess perspectives and knowledge of patients with cancer on mpox and their willingness to receive mpox vaccination.

METHODS

A cross-sectional study was conducted among patients with cancer using a structured questionnaire. The survey encompassed sociodemographic data, mpox knowledge, attitudes towards vaccination, and willingness to mpox vaccination. Multivariate logistic regression analyses were performed to identify independent predictors of vaccination willingness.

RESULTS

A total of 275 patients were included. A significant majority (73.1%) of respondents wanted to learn more about mpox, and 33.8% were confident in global efforts to control the outbreak. 69.1% of the patients were unwilling to receive the mpox vaccine, mainly due to safety concerns and the interference with the anti-cancer treatment. In multivariable analysis, younger age (<65 years) (OR = 1.836, 95% CI:1.030-3.271, p = 0.039), information about mpox before (OR = 1.899, 95% CI:1.104-3.268, p = 0.021) and good knowledge about mpox (OR = 1.968, 95% CI:1.118-3.465, p = 0.019) were significant predictors of willingness to vaccinate against mpox.

CONCLUSION

A substantial proportion of cancer patients in Turkey are hesitant to receive the mpox vaccine, primarily due to concerns about safety and its implications for cancer treatment. Targeted educational interventions that address these specific concerns and enhance understanding of the benefits of vaccination are critical to improving vaccine uptake in this vulnerable population.

Vaccine hesitancy and routine revaccination among adult HCT survivors in the United States: A convergent mixed methods analysis

Revaccination to restore immunity to vaccine-preventable diseases (VPDs) is essential risk mitigation in the prevention of infectious morbidity and mortality after hematopoietic cell transplantation (HCT). However, revaccination rates have been shown to be insufficient and to what extent vaccine hesitancy contributes to survivors not becoming fully revaccinated is unknown. We performed a cross-sectional, mixed methods survey-based study to explore how vaccine hesitancy influences revaccination among US adult HCT survivors who were 2 to 8 years after transplant. Participants were asked to complete the Vaccination Confidence Scale (VCS) and open-ended survey items regarding vaccine confidence. The survey response rate was 30 %; among 332 respondents, vaccine confidence was high in 69 %, medium in 20 %, and low in 11 %. On multivariable analysis, four factors associated with high vaccine confidence were: predominantly Democrat zip codes (per 2020 election results), ability to pay for revaccination out of pocket, receipt of pre-HCT adult vaccines, and receipt of COVID-19 vaccines. From 189 participants who also answered open-ended items, 14 themes associated with vaccine confidence were identified and collapsed into 4 categories based on the VCS: Benefits, Harms, Trust, and Other. Merged analysis showed congruence between VCS scores and open-ended survey responses and created a narrative about the relative importance of the constructs when approaching revaccination by vaccine confidence level. These findings significantly expand our knowledge of how vaccine hesitancy influences revaccination uptake among US adult HCT survivors. Population-specific interventions to approach vaccine-hesitant survivors should be developed and tested.

Assessment of adherence to routine vaccination schedules in oncology patients

INTRODUCTION

Patients diagnosed with cancer are at an increased risk of infection. Vaccines remain one of the most critical public health strategies in limiting infectious diseases, with a heightened importance in cancer patients. Data across the general US population indicates that vaccine adherence rates are suboptimal across all adult vaccine schedules. This study aims to define vaccine adherence rates within the oncology population.

METHODS

This retrospective cohort study includes adult patients with a new cancer diagnosis. Vaccine administrations for COVID-19 (SARS-CoV-2), influenza, pneumococcal, tetanus/diphtheria/pertussis (TDaP), herpes zoster (RZV), human papillomavirus (HPV), and hepatitis B (hepB) were assessed. The primary outcome was complete vaccine adherence.

RESULTS

Two hundred and eighty-three oncology patients were included. The median age at diagnosis was 63 years old, and most subjects were females (60%). The two most common malignancies were gastrointestinal and breast cancer at 26.5% and 15.2%, respectively. Suboptimal vaccine adherence rates were observed across the entire oncology population. Complete adherence was observed in only 1.4% of patients. Vaccine specific adherence rates were as follows, SARS-CoV-2: 38.9%; influenza: 11.4%; pneumococcal: 12.7%; TDaP: 13.1%; RZV: 3.5%; HPV: 0%; and hepB: 34%. Among the vaccine schedules assessed, SARS-CoV-2 vaccination rates were the highest with 38.9% of patients being fully adherent and 73% receiving at least one dose.

CONCLUSION

Lower vaccine adherence rates were observed in oncology patients compared to currently published rates. Providers and pharmacists can play a role in assessing and counseling patients on the importance of vaccine adherence before chemotherapy is initiated and after a remission is obtained.

Early COVID-19 Vaccine Initiation and Completion Among Cancer Survivors and Barriers to Vaccine Completion: Implications for Future COVID-19 Vaccination Uptake Rates

PURPOSE

Cancer survivors are considered by public health officials as a high-risk group in the United States for severe complications from COVID-19. We aimed to characterize patterns of early uptake of the COVID-19 vaccine among cancer survivors and to determine modifiable barriers to vaccine completion that can be addressed to ensure future booster adherence.

METHODS

Cross-sectional data of vaccine uptake by summer 2021 was extracted from adult cancer survivors enrolled in the "All of Us" research program. Vaccine completion was determined based on receiving at least two doses. We assessed sociodemographic factors, socioeconomic barriers (education, income, health insurance status, housing, and employment status), and COVID-19 vaccine uptake by Summer 2021, employing multivariable ordinal logistic regression for those who were unvaccinated, had initiated vaccine uptake, and had completed COVID-19 vaccination.

RESULTS

Of the 514 cancer survivors in the sample, 73.7% were fully vaccinated by summer 2021. Those who received no vaccine doses showed higher proportions of SES barriers, medical distrust, and perceived lack of need barriers. Race (non-Hispanic White vs. other) was not statistically significantly associated with vaccine uptake (OR (95% CI) = 0.94 (0.51, 1.70)), while for every additional SES barrier, there was a 40% decrease (OR (95% CI) = 0.60 (0.48, 0.75)) in the odds of receiving more COVID-19 vaccine doses. Higher medical distrust and perceived lack of need were associated with 56% (OR = 0.44, 95% CI: 0.32-0.59) and 39% (OR = 0.61, 95% CI: 0.43-0.87) lower odds, respectively.

CONCLUSION

Racial/ethnic disparities in vaccine uptake may be explained by SES barriers. Addressing SES disparities and fostering medical trust may enhance future COVID-19 vaccination uptake rates for this high-risk group.

Frequency of vaccine hesitancy among patients with advanced cancer

BACKGROUND

Vaccine hesitancy has become prevalent in society. Vulnerable populations, such as those with cancer, are susceptible to increased morbidity and mortality from diseases that may have been prevented through vaccination.

OBJECTIVES

Our objective was to determine patient perception of vaccine efficacy and safety and sources of information that influence decisions.

METHODS

This study was a prospective cross-sectional survey trial conducted from March 10, 2022, to November 1, 2022, at a Supportive Care Clinic. Patients completed the survey with a research assistant or from a survey link. Vaccine hesitancy was defined as a response of 2 or more on the Parent Attitudes About Childhood Vaccines (PACV-4). Perception on vaccine safety and efficacy along with the importance of sources of information were determined by a questionnaire.

RESULTS

Of the 72 patients who completed the PACV-4, 30 were considered vaccine-hesitant (42%). Of those who completed the survey alone (35), 23 (66%) were vaccine-hesitant; and of those who completed the survey with the help of a study coordinator (37), 7 (19%) were vaccine-hesitant. The most important source for decision-making was their doctor (82%, 95% CI 73-89), followed by family (42%, 95% CI 32-52), news/media (31%, 95% CI 22-41), and social media (9%, 95% CI 4-16). Clinical and demographic factors including age, gender, race/ethnicity, education level, and location of residence were not associated with vaccine hesitancy.

SIGNIFICANCE OF RESULTS

Vaccine hesitancy is present among patients with advanced cancer. The high value given to the doctor's recommendation suggests that universal precautions regarding vaccine recommendation may be an effective intervention.

Attitudes towards COVID-19 Vaccination in Adults with Haematological Malignancies

INTRODUCTION

Despite people with haematological malignancies being particularly vulnerable to severe COVID-19 infection and complications, vaccine hesitancy may be a barrier to optimal vaccination. This study explored attitudes towards COVID-19 vaccination in people with haematological malignancies.

METHODS

People with haematological malignancies at nine Australian health services were surveyed between June and October 2021. Sociodemographic and clinical characteristics were collected. Attitudes towards COVID-19 vaccination were explored using the Oxford COVID-19 Vaccine Hesitancy Scale, the Oxford COVID-19 Vaccine Confidence and Complacency Scale, and the Disease Influenced Vaccine Acceptance Scale-Six. Open-ended comments were qualitatively analysed.

RESULTS

A total of 869 people with haematological malignancies (mean age 64.2 years, 43.6% female) participated. Most participants (85.3%) reported that they had received at least one COVID-19 vaccine dose. Participants who were younger, spoke English as a non-dominant language, and had a shorter time since diagnosis were less likely to be vaccinated. Those who were female or spoke English as their non-dominant language reported greater vaccine side-effect concerns. Younger participants reported greater concerns about the vaccine impacting their treatment.

CONCLUSION

People with haematological malignancies reported high vaccine uptake; however, targeted education for specific participant groups may address vaccine hesitancy concerns, given the need for COVID-19 vaccine boosters.

Relationship between vaccine hesitancy and vaccination behaviors: Systematic review and meta-analysis of observational studies

BACKGROUND

Vaccination is crucial for prevention of infectious diseases, and identification of the impact of vaccine hesitancy on vaccination programs is crucial for early intervention and formulation of policies to alleviate vaccine hesitancy. The aim of this systematic review was to explore the relationship between vaccine hesitancy and negative vaccination behavior globally.

METHODS

We searched for observational studies in various databases. We conducted a meta-analysis using pooled odds ratios (OR) and 95 % confidence intervals (CI), performed meta regression and subgroup analysis to explore the role factors such as location and individual characteristics on the association between vaccine hesitancy and vaccination behavior.

RESULTS

A total of 46 articles were included in systematic analysis and 34 articles were included in the meta-analysis. The systematic analysis comprised 162,601 samples, whereas the meta-analysis included 147,554 samples. The meta-analysis showed that a higher rate of vaccine hesitancy was associated with an increased likelihood of adverse vaccination behaviors (all adverse behaviors: OR = 1.50, 95 % CI, 1.33-1.70, P < 0.001; unvaccinated: OR = 1.48, 95 % CI, 1.29-1.70, P < 0.001; vaccine delay: OR = 2.61, 95 % CI, 1.97-3.44, P < 0.001). The meta-regression results indicated that the heterogeneity observed was mainly from sample selection methods, age of vaccinees and the health status of participants. The results showed that parents of minor vaccinees or without high-risk health status had a higher association between vaccine hesitancy and vaccine uptake compared with populations exposed to higher health risks or adult vaccinees.

CONCLUSION

The findings provide evidence on the association between vaccine hesitancy and adverse vaccination behaviors. The results showed that these population-specific factors should be considered in future research, and during formulation of interventions and implementation of policies to improve vaccination uptake.

Factors Associated With COVID-19 Vaccine Hesitancy in Rheumatology Outpatients in New York City

OBJECTIVE

The aim of this study was to measure COVID-19 vaccine hesitancy among rheumatology outpatients from an early COVID-19 "hotspot" during the initial period of vaccine availability.

METHODS

In March 2021, a Web-based survey was sent to 7505 adults seen at a Rheumatology Division in New York City. We evaluated characteristics associated with 3 categories of COVID-19 vaccination status: declined, undecided, and willing/already received. We used multinomial logistic regression models to calculate relative risk ratios assessing predictors of vaccination status.

RESULTS

Among 2384 (32%) respondents (80% female, 87% White, 59% with systemic rheumatic disease), 2240 (94.0%) were willing/already received COVID-19 vaccination, 88 (3.7%) were undecided, and 56 (2.3%) declined. Compared with those willing/already vaccinated, those declining or undecided were younger, more likely identified as Black or Hispanic/Latinx, and had lower household income and educational attainment. Immunosuppressive medication use did not differ among groups. After multivariable adjustment, every 1-year increase in age was associated with a 0.96 lower relative risk of declining or being undecided versus willing/already vaccinated. Respondents identifying as Black versus White had a higher relative risk ratio of being undecided (4.29 [95% confidence interval, 1.96-9.36]), as did those identifying as Hispanic/Latinx versus non-Hispanic/non-Latinx (2.81 [95% confidence interval, 1.29-6.09]). Those declining vaccination were least likely to believe in general vaccine importance or the safety and efficacy of the COVID-19 vaccine.

CONCLUSIONS

Among rheumatology patients in New York City with and without systemic rheumatic disease, COVID-19 vaccine uptake was high after its initial availability. Sociodemographic but not medication-related factors were associated with vaccine hesitancy; these findings can inform future rheumatology vaccination programs.